function toggle(showHideDiv,switchImg){
   var div=document.getElementById(showHideDiv);
   var img=document.getElementById(switchImg);
   if(div.style.display=='block'){
       div.style.display='none';
       img.innerHTML = '<img src="../images/show.png"  alt="show" width="20" height="20">';
   }
   else{
       div.style.display='block';
       img.innerHTML = '<img src="../images/hide.png"  alt="show" width="20" height="20">';
   }
}